Power-control mechanism



Sept 2, 1930. .1. s. HERRoN 1,775,038

POWER CONTROL MEGH'ANISM rund June 29. 192s 2 sheds-snaai 2 x v 2gATTORNEY Patented Sept. y2, 1930 PATENT o FFlcE JAMES vS. HER/RON, OFCOVINGTON, OKLAHOMA POWER-CONTROL MECHANIM Application filed June 29,

. This invention relates to improvements in power driven mechanisms andis especially adapted for controlling the operation of sewingmachines ofthe type used for sewing leather, and heavy fabric. Y

An object of the present invention isthe provision of a clutchcontrolling means for machines of this character,l whereby the starting,stopping and speed of operation of the machine may be controlled by thefoot of the operator, and thus leave both of his hands free for handlingthe work.

With 'the' above and other objects in view, the invention furtherincludes the following novel features and details of construction, to behereinafter more fully described, illus trated in the accompanyingdrawings and pointed out in the appended claim.

In the drawings y Figure 11is an elevation of a sewing machine equippedwith the invention.

Figure 2 is a fragmentary sectional view on the line 2 2 of Figure 1. n

Figure 3 is an enlarged section on the line 3-3 of Figure 2.v A

Figure 4 is a detail perspective view of the bell crank lever. Y

Figure 5 is a like view of the pivoted arm. Figure 6 is a detailperspective view of the` bracket.

, Referring to the drawings in detail wherein llikecharacters ofreference denote corresponding parts, the invention 1s shown as appliedto a sewing machine which includes a head 10 mounted upon a stand 11whose supporting frame rotatably supports a driven shaft 12. l Thisshafthas fast thereon a driven 'Y wheel 13 which is provided with aperipheral groove, and this'wheel is driven from a motor 14 through themedium of a belt 15.

Freely rotatable upon the'y shaft 12 is a Y' power take-01T Apulley 16and this pulley has its inner flat face 16 arranged to frictionallyengage a fiat face 17 provided upon the wheel Y 13. The adjacent facesof the wheel'13 and 192s. serial no. 289,218.

a wear plate 2O provided within the recess of the pulley16. l f

The pulley 16 is peripherallygrooved to receive a belt 21 and this beltengages a grooved pulley 22 provided upon the shaft 23 of the head 10.Thus, when the friction faces 16 and V17 are engaged, motion will beimparted to the shaftv23 proportionate to the degree of frictionalcontact. n

Pivotally mount-ed as shown at 24 upon a bracket 25 secured to the frameof the machine is a bell crank lever having a short arm 26 whose freeend is adapted to engage a wear plate 27 carried by the outer face ofthe pulley 16. The other or long armv28 has its outer end slotted forthe passage of a pin 29 which serves to connect this arm of the leverwith one end of the rod 30. The other end of this rod is pivotallyconnected as shown at 31 witha foot pedal 32 which is mounted upon theframe of the machine.

Pivotally mounted upon the machine frame as shown at 33 is one end of anarm 34 and the other end of this arm is connected with the long arm 28of the bell crank lever through the pin 29.

Normally, the spring 19 separates the pulley 16 from the wheel 13, sothat the pulley will be free upon the driven shaft 12 and will notrotate when the motor 14 is operating. When it is desired to operate themachine, the foot pedal 32 is pressed downward so to move the bell cranklever pivotally and force the friction Vfaces 16 and 17 into engagement,the degree of engagement determining the speed of operation of themachine. As soon as pressure upon the pedal 32 is released, the frictionfaces 16 and 17 will be separated.

The arm 34 acts to steady the outer end Vof the arm 28 of the bell cranklever in its Shaft, adriven wheel fast upon said shaft and operativelyconnected with a source of f power, a power take-oil wheel'freelymounted upon said shaftand adapted to engage the driven wheel to receivemotion, spring `means to yieldingly separate the wheels,aa pivotallymounted rloell*crank'leverhaving one of-its arms arranged toengage thetake-olif lwheel to force the latter into engagement with the drivenWheelwhen said lever is moved pivotally, a foot pedal, a rod connectingthe other 1 arm of the bell Crank lever with the oot y l said other armof the vlo'ell crank lever at its j JAMES vs. HERRoN. d

